anybody fit an LC engine into aircooled chassis?

[zig]

just wondering if anyone has ever done this before

seems plenty of Hybrid guy's out there should know , would be interesting to see if poss?

ZiG

[123]

Saw a lc engine in a yr5 year ago just a bracket for back mounts and rad looked mint

[midlifecrisisrd]

Dusty did a ypvs motor in aircooled so same fitment

rdlccrazy.proboards.com/thread/43493/rd-tz-lc?page=1

Steve

[123]

Saw a lc engine in a yr5 year ago just a bracket for back mounts and rad looked mint

[dusty350]

Yep, as Steve said, Lc and Pv will fit, as they are the same engine, mount wise. Seen a few different ways of doing it too. Not the easiest swap to do though;

20180610_182352 by dusty miller, on Flickr

Dusty

[pdxjim]

Rob "Robakun" New did a couple about ten years ago in California.



www.2strokeworld.net/forum/index.php?topic=2553.0

[dusty350]

You can also fit Lc cylinders onto an Ac bottom end. Obviously needs other components and work to do, but that's basically what early Tz's were (watercooled top end on an Ac bottom)

[steeley]

Dec 31, 2020 21:29:31 GMT 1 dusty350 said:

You can also fit Lc cylinders onto an Ac bottom end. Obviously needs other components and work to do, but that's basically what early Tz's were (watercooled top end on an Ac bottom)

As dusty says fit an lc top end ect . I was thinking of doing this years ago when myself and a mate of mine were bringing a 250e back to life. I had an idea for the rad mounts to bolt on and i was going to run an electric water pump . In the finish it didn't happen .

[dusty350]

There's pro's and cons for complete engine vs top end of course. The aircooled engine has 4 mounting points, only 1 of which you can readily use (front, top engine bolt), 2 can be ignored, so the only 1 to sort is the rear top mount. I found the frame part of that mount would foul the Lc engine so you will need to do something with that for sure. I cut it off the frame tube, fitted and centralised the engine in the frame, and then did a bit of CAD (Shreddies box this time !) to design new rear mounting plates that were then copied in steel and welded to the frame. Front engine mount needs 1 spacer each side as the Lc engine casting is narrower. Exhaust exit is critical as Ac downpipes went out and around the frame downtubes, not inside them like Lc/Pv, and it's quite narrow between the tubes in comparison. Allspeeds work but it's tight ! So keeping the Ac bottom end saves a lot of work, and an Lc top end would only require engineering for the rad mounts. But, the Ac engine is a fair bit heavier than an Lc, so if weight saving is key, Lc beats Ac. I didn't have an engine for the Cafe bike at the beginning, and wanted to fit an Ac 400, but couldn't find one anywhere, so bought and used a Pv engine instead.

Dusty

[zig]

Dec 31, 2020 20:49:17 GMT 1 dusty350 said:

Yep, as Steve said, Lc and Pv will fit, as they are the same engine, mount wise. Seen a few different ways of doing it too. Not the easiest swap to do though;

20180610_182352 by dusty miller, on Flickr

Dusty

Really interesting reading the basic's from everyone....i think it would be a fasinating build if not without its pro's and con's but that to me is what makes it interesting...have you a thread Dusty on your finished LC AC project or is it still 'work in progress' ?

ZiG

[dusty350]

Hi
Still a work in progress although not much to do now. Steve linked it above - it's the rd-tz-lc thread in the resto section. Plenty of pics to show what was done.

Dusty

[botty]

Put a ypvs motor in one. Same mounts as Lc.

Front frame mounts can be utilised. Tears need chopping out and re making.

Cross member on the bottom of the frame need channeling out to fit torsion bars

browser mouse event test page

[zig]

Jan 1, 2021 20:49:12 GMT 1 botty said:

Put a ypvs motor in one. Same mounts as Lc.

Front frame mounts can be utilised. Tears need chopping out and re making.

Cross member on the bottom of the frame need channeling out to fit torsion bars

browser mouse event test page

that is really beautiful.....and inspiring to say the least

[zig]

Dec 31, 2020 20:49:17 GMT 1 dusty350 said:

Yep, as Steve said, Lc and Pv will fit, as they are the same engine, mount wise. Seen a few different ways of doing it too. Not the easiest swap to do though;

20180610_182352 by dusty miller, on Flickr

Dusty

[zig]

Hi Dusty.....is it all year AC 250 frames will mod or just certain year/model??

ZiG

[dusty350]

Hi
Certainly "C" models onwards, and maybe earlier, but go for a frame with the bolt on right front frame bracket - it will be a lot easier getting the engine in and out. The Cafe bike uses a 250d frame.

Dusty